TheGrumpyDeveloper

This plugin allows users to host their own IPN listener on their wordpress install. It will connect to the email service via the API and allow the user to map a 
paypal button to an active campaign list. The pro version of the plugin will allow users to map multiple buttons to multiple lists. Currently just Active Campaign is supported but in the next version, will be adding Mailchimp and other popular providers.

Bridge – Paypal to Email Lists

This plugin allows users to map their paypal buttons to email campaign lists in Active Campaigns (and soon mailchimp and others)

Vladimir Prelovac

Bluesnap for WordPress allows seamless Bluesnap Payment Gateway IPN integration for WordPress blogs.
Main Features:
<ul>
<li>Receive IPN (instant payment notification) directly in your WordPress blog</li>
<li>Admin dashboard with charts and reports</li>
<li>Automatically register buyers as users on the blog</li>
<li>Send the buyers automatic email</li>
</ul>
Bluesnap for WordPress relies on Bluesnap IPN (instant payment notification) to provide real time reports about your sales. It can also automatically register new buyers as users on your blog which allows you to for example use membership plugins.
For more information visit <a href="http://www.prelovac.com/vladimir/wordpress-plugins/plimus-for-wordpress" rel="nofollow ugc">Bluesnap for WordPress plugin page</a>.
<h3>License</h3>
This file is part of Bluesnap for WordPress.
Bluesnap for WordPress is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Bluesnap for WordPress is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Bluesnap for WordPress. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Bluesnap for WordPress

Plimus for WordPress allows seamless Bluesnap Payment Gateway IPN integration for WordPress blogs.

Bridge – Paypal to Email Lists vs Bluesnap for WordPress